I source vintage postcards, antiques, and historical artifacts, then research them using open-source intelligence methods. Each item gets a full investigation: tracing origins, identifying people and places, cross-referencing newspaper archives, YouTube footage, social media, university collections, government records, and historical databases. For postcards, I also use the Scott Catalogue system for stamp identification and cross-reference eBay listings where other collectors have documented their own findings. The results are published as "Deep Dive in the Archive" stories on Substack and permanently archived on frostmere.co.